: =~ (equal-sign tilde) and m" ... " in .htaccess directive I saw this bit of code on an old forum post: SSLRequire %{HTTP_HOST} =~ m".secure.powweb.com" And I was just wondering what the

@BetL925

That is used for matching a regex in a string.

See man perlop:


Binary "=~" binds a scalar expression to a pattern match. Certain
operations search or modify the string $_ by default. This operator
makes that kind of operation work on some other string. The right
argument is a search pattern, substitution, or transliteration. The
left argument is what is supposed to be searched, substituted, or
transliterated instead of the default $_.


and


m/PATTERN/msixpogc
/PATTERN/msixpogc
Searches a string for a pattern match, and in scalar context
returns true if it succeeds, false if it fails. If no string
is specified via the "=~" or "!~" operator, the $_ string is
searched. (The string specified with "=~" need not be an
lvalue--it may be the result of an expression evaluation, but
remember the "=~" binds rather tightly.) See also perlre. See
perllocale for discussion of additional considerations that
apply when "use locale" is in effect.
...
If "/" is the delimiter then the initial "m" is optional. With
the "m" you can use any pair of non-alphanumeric, non-
whitespace characters as delimiters.

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